BRAIN and NERVE－神経研究の進歩67巻9号

2015年09月発行

原著

相対音感に関わる灰白質の髄鞘と神経線維束の可視化—左島皮質後部の役割

著者： 清水祐一郎¹² 酒井邦嘉¹²

所属機関： ¹東京大学大学院総合文化研究科相関基礎科学系 ²CREST日本科学技術振興機構

ページ範囲：P.1147 - P.1155

文献概要

相対音感とは外的または内的な音高に基づいて1音の高さを同定する能力である。基準音を途中で3回提示して音名を解答させる課題の成績により，参加者を3群に分けた。灰白質の髄鞘をT₁強調画像とT₂強調画像の比で可視化したところ，満点群で左島皮質後部において有意差が検出された。さらに，左島皮質と聴覚野を結ぶ線維の前方領域で満点群の方が成績下位群よりも一貫して描出できた。これらの領域は音声情報の処理に関与しており，音楽の能力が言語能力に関連すると考えられる。

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